US7382718B2 - Transmitting and receiving method for reducing distortion caused by a time-varying channel in an orthogonal frequency division multiplex system - Google Patents
Transmitting and receiving method for reducing distortion caused by a time-varying channel in an orthogonal frequency division multiplex system Download PDFInfo
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- US7382718B2 US7382718B2 US10/334,354 US33435402A US7382718B2 US 7382718 B2 US7382718 B2 US 7382718B2 US 33435402 A US33435402 A US 33435402A US 7382718 B2 US7382718 B2 US 7382718B2
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/06—TPC algorithms
- H04W52/16—Deriving transmission power values from another channel
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
- H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
- H04L1/0618—Space-time coding
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0204—Channel estimation of multiple channels
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/38—TPC being performed in particular situations
- H04W52/42—TPC being performed in particular situations in systems with time, space, frequency or polarisation diversity
Abstract
Description
where i is an index in the group.
where i is an index in the group. The step (c) includes: taking FFT of the received signals and combining the signals of the M sub-channels in each data group by addition or subtraction according to a sign of the weight value.
where i is an index in the group. The step (c) includes: combining the signals of the M sub-channels in each data group from the receive antennas by addition or subtraction according to a sign of the weight value and then subjecting the received signals to SFBC combination.
where i is an index in the group. The step (c) includes: combining the signals of the M sub-channels in each data group by addition or subtraction according to a sign of the weight value and then subjecting the received signals to MRRC combination.
where i is an index in the group. The step (c) includes: combining the signals of the M sub-channels in each data group from the receive antennas by addition or subtraction according to a sign of the weight value and then subjecting the combined signals to SFTC decoding.
where n is a time domain index; np is a discrete time-delay sample of the p-th path; x(n) is a transmit signal in the time domain; and w(n) is an additive white Gaussian noise (AWGN). The frequency-domain signal of the
where k is a frequency domain index; N is an FFT size; X(k) is a transmit signal in the frequency domain; I(k) is a time-varying channel distortion term; and Hp(k) is a single-tone frequency response of the p-th path when X(k)=δ(k) and can be expressed as follows:
where E represents an expected value. The CINR of the individual sub-channel is dependent upon the interference between adjacent channels caused by the time-varying channel, and the time-varying channel distortion is determined by the rate of change of the channel in one OFDM symbol. With a high rate of change of the channel in the time domain even with an insignificant AWGN power, the time-varying channel distortion power cannot be reduced, thereby hardly improving the bit error rate when the CINR is less than the required SNR for the given modulation order.
where the complex coefficients, ap,d and bp can be calculated according to the following LS (Least Square) equation:
where hp(n) is the actual channel. The single tone frequency response of approximated time-varying channel Ĥp(n) is expressed as follows:
where Hp(k) is the term causing the time-varying channel distortion in the p-th path; and αmHp(k+m) is the term eliminating the time-varying channel distortion in the p-th path. In the equation 13, the time-varying channel distortion of the received signal can be minimized by transmitting data with αm as a weight value for minimizing the error ε(k). The weight value αm can be calculated by the LS or MMSE (Minimum Mean Square Error) estimating equation and is greatly dependent upon the rate of change of the channel in one OFDM symbol. Actually, the complex coefficients ap,d and bp can be estimated with a channel predictor and used to determine the optimal weight value, in step 120.
X(l+1)=−αX(l), l=0,2,4, . . . , N−2 [Equation 18]
MSE=E└Ĥ(S ƒ ·i)−
where HnTx,nRx,p(k) is the single-tone frequency response of a time-varying channel formed between the nTx-th transmit antenna and the nRx-th receive antenna. When channel information between the respective antennas is available at the transmitter, the weight value αm is estimated by the LS or MMSE estimation method.
where H1,p(k) is the single-tone frequency response of a channel formed between the first transmit antenna and the receive antenna; and H2,p(k) is the single-tone frequency response of a channel formed between the second transmit antenna and the receive antenna. The equation 25 may be combined with the equation 20 as follows:
{circumflex over (X)}(l)=(|
{circumflex over (X)}(l+1)=(|
where HnTx,nRx,p(m) is the single-tone response of a channel formed between the nTx-th transmit antenna and nRx-th receive antenna; and XnTx(m) is a signal of the m-th sub-channel transmitted through the nTx-th antenna. The above equation can be rewritten as follows by a combination of adjacent channels:
Claims (18)
Applications Claiming Priority (2)
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KR10-2002-0075014A KR100511559B1 (en) | 2002-11-28 | 2002-11-28 | Transmitting and Receiving Method having Distortion Reduction Caused by a Time-varying Channel in an Orthogonal Frequency Division Multiplex System |
KR2002-75014 | 2002-11-28 |
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US20040114506A1 US20040114506A1 (en) | 2004-06-17 |
US7382718B2 true US7382718B2 (en) | 2008-06-03 |
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KR100511559B1 (en) | 2005-08-31 |
US20040114506A1 (en) | 2004-06-17 |
KR20040046967A (en) | 2004-06-05 |
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